President Mohamed Mursi clung to office on Tuesday after rebuffing an army ultimatum to force a resolution to Egypt’s political crisis, and the ruling Muslim Brotherhood sought to mass its supporters to defend him.

But the Islamist leader looked increasingly isolated, with ministers resigning, the liberal opposition refusing to talk to him and the armed forces, backed by millions of protesters in the street, giving him until Wednesday to agree to share power.

In a defiant 2 a.m. statement, Mursi’s office said the president had not been consulted before the armed forces chief-of-staff set a 48-hour deadline for a power-sharing deal and would pursue his own plan for national reconciliation.